1 #ifndef _LINUX_NAMEI_H
2 #define _LINUX_NAMEI_H
3
4 #include <linux/linkage.h>
5
6 struct vfsmount;
7
8 struct open_intent {
9 int flags;
10 int create_mode;
11 };
12
13 enum { MAX_NESTED_LINKS = 5 };
14
15 struct nameidata {
16 struct dentry *dentry;
17 struct vfsmount *mnt;
18 struct qstr last;
19 unsigned int flags;
20 int last_type;
21 unsigned depth;
22 char *saved_names[MAX_NESTED_LINKS + 1];
23
24 /* Intent data */
25 union {
26 struct open_intent open;
27 } intent;
28 };
29
30 /*
31 * Type of the last component on LOOKUP_PARENT
32 */
33 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
34
35 /*
36 * The bitmask for a lookup event:
37 * - follow links at the end
38 * - require a directory
39 * - ending slashes ok even for nonexistent files
40 * - internal "there are more path compnents" flag
41 * - locked when lookup done with dcache_lock held
42 */
43 #define LOOKUP_FOLLOW 1
44 #define LOOKUP_DIRECTORY 2
45 #define LOOKUP_CONTINUE 4
46 #define LOOKUP_PARENT 16
47 #define LOOKUP_NOALT 32
48 /*
49 * Intent data
50 */
51 #define LOOKUP_OPEN (0x0100)
52 #define LOOKUP_CREATE (0x0200)
53 #define LOOKUP_ACCESS (0x0400)
54
55 extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
56 #define user_path_walk(name,nd) \
57 __user_walk(name, LOOKUP_FOLLOW, nd)
58 #define user_path_walk_link(name,nd) \
59 __user_walk(name, 0, nd)
60 extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
61 extern int FASTCALL(path_walk(const char *, struct nameidata *));
62 extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
63 extern void path_release(struct nameidata *);
64 extern void path_release_on_umount(struct nameidata *);
65
66 extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
67 extern struct dentry * lookup_hash(struct qstr *, struct dentry *);
68
69 extern int follow_down(struct vfsmount **, struct dentry **);
70 extern int follow_up(struct vfsmount **, struct dentry **);
71
72 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
73 extern void unlock_rename(struct dentry *, struct dentry *);
74
75 static inline void nd_set_link(struct nameidata *nd, char *path)
76 {
77 nd->saved_names[nd->depth] = path;
78 }
79
80 static inline char *nd_get_link(struct nameidata *nd)
81 {
82 return nd->saved_names[nd->depth];
83 }
84
85 #endif /* _LINUX_NAMEI_H */
86
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